Liquid mixing device



Feb. 16, 1937. s WATTS 2,071,095

LIQUID MIXING DEVICE ,Y

Filed June 18, 1951 l VENTOR MI jm l BY TTORNEY Patented Feb. 16, 1937 UNITED STATES PATENT OFFICE 3 Claims.

This invention relates to liquid mixing devices, and has for an object a device which will add to a continuously flowing stream of one liquid aienite proportionate amount of another liq- According to this invention, the liquid stream t'o which additions are to be made is caused to flow through a casing in which is mounted a rotor operable by the stream. A small stream, preferl0 ably a branch stream diverted from the main stream, is supplied to a hydraulic engine, the operation of which is controlled by a valve actuated by said rotor. The hydraulic engine embodies a pump by means of which unit quantities of the liquid to be added are successively intro' duced into the stream flowing from the casing. The ratio of the liquid added to the iowlng stream remains constant .despite changes in velocity of the owing stream as the volume of liquid added is proportional to the rotational speed of the rotor.-

Other objects, novel features and advantages v of this invention will'be apparent from the foregoing specification and accompanyingdrawing, wherein:

Fig. 1 is a plan view partly in section of a. device embodying the invention, and

Fig. 2 is a section on the line 2-2 of Fig. 1. The device comprises a two-part casing `III forming a substantially cylindrical chamber II communicating with a tangentially arranged v conduit Illa having an inlet I2 and an outlet I3. Within the chamber a rotor I4 is mounted upon a shaft I5 which is journalled in a hub I6 extending from one part of the casing I0. Buckets I1 are mounted on the periphery of the rotor and extend into the conduit IIa. The casing is providedhwith a passageway I8, one end of which communicates with the chamber II. The other end of the passageway I8 leads into a tubular chamber I9 in which is mounted a cylindrical valve bushing 20. The casingalso is provided with`a cylinder 2|, the opposite ends of which communicate through conduits 22 and ports 23 with the interior of the valve bushing 2|). Within the cylinder 2|- is provided a floating piston 24. A conduit 25 is provided leading from the tubular chamber. I9 at a point opposite the passageway I8 and communicates with a pipe 26. The passageway I8 communicates with the interior of the valve bushing through a port 21 and the conduit 25 communicates with the interior of the valve bushing through a port 28.`

A valve 29 is rotatably mounted in the bushing 20 and is provided with two channels by at each stroke of the plunger 33. By turning the means of which successive ports in the valve bushing are put into communication with each o other. A spring 30 is provided for keeping the valve tightly seated in the bushing and an adjusting screw 3l permits varying the pressure exerted by the spring 30. The valve 29 is coupled to the shaft I5 for rotation with the rotor I4. As the valve rotates communication is alternately established between each end of the cylinder 2| and the passageway I8 as well as bel0 tween each end of the cylinder and passageway 25.

A pump cylinder 32 is supported by the hub I6 in alinement with the cylinder 2I and a plunger 33 is mounted for reciprocation in said cylinder, l5 the plunger being attached at one end to the piston 24. A tank 34 fo'r the liquid ,to be added is connected by a pipe 35 with the cylinder '32, the pipe being provided with a check valve 36. A pipe 31 leads from the cylinder 32 into the outlet I3 from the casing and isprovided with acheck valve 38. In operation, the rotor I4 is operated by liquid owing through the conduit IIa and operatesl the valve 29 to control the operation of the hy- 25 draulic engine embodied in the hub I6. By means of the valve 29, the ends of the cylinder 2I are alternately put into communication with the passageways I8 and 25, thereby causing reciprocation of the piston 24 in timed relation to 3'0 the rotation of the rotor I4. The plunger 33 reciprocates with the piston 24 and at each reciprocation thereof a definite volume of liquid from the tank 34 is pumped through the pipe 31 into the outlet I3. The frequency of reciprocation of 35 the plunger is controlled by the rotational speed of the rotor and the ratio of added liquid to that flowing through the conduit remains constant irrespective of flowing variations.l

The volume of liquid added tothe flowing 40 stream at each reciprocation of the piston ma;r be varied by changing the lengthA of the stroke of the piston 24. For this purpose there vis provided an adjusting screw 39 having an operating button 40. 'I'he adjusting screw 39 is threaded, into a cylindrical supporting member .40 and carries a sleeve 4I which surrounds the member 40. The member 40 is provided with scale markings which indicate the volume of liquid pumped button 40 and operating the scalemarkings, the amount of liquid added to the flowing stream may be easily and accurately Varied.

The above described apparatus insures mixing of two liquids in denite and uniform propor- .7,5

tions which proportions may be varied as desired. The amount of liquid added for each rotation of the rotor I4 is the same whatever the speed of the rotor. As the speed of the rotor is directly dependent upon the ow of liquid through the chamber, the ratio of the two liquids brought together by the device remains constant irrespective of variations in rate of ow through the conduit. y

It is of course apparent, that various structural modifications may be made in the apparatus above described, without in any way departing from the spirit of the invention as defined in the appended claims.

I claim:

l. An apparatus for adding to a stream of liquid unit quantities of a second liquid in predetermined ratio by volume, said apparatus comprising a conduit through which the stream of liquid flows, a ow-responsive motor arranged in said conduit for operation by said stream of liquid proportional to the rate of flow of said stream, a cylinder, a member mounted in said cylinder for back and forth movement, a valve for alternately supplying liquid under pressure to and discharging liquid from the ends of said cylinder, means connecting said motor and valve whereby the valve is actuated at a frequency proportional to the rate of ow of said stream of liquid to alternately admit liquid under pressure to one end of the cylinder While discharging liquid from the other end, a source of the second liquid, a pumpactuated by said member, and connections for said pump whereby successive unit quantities of said second liquid are drawn from said source and discharged into the rst liquid in definite ratio to the rate of ow of said stream of liquid through said conduit,

2. An apparatus for adding to a stream of liquid unit quantities of a second liquid in predetermined ratio by volume, said apparatus comprising a conduit through which the stream of liquid owsI a now-responsive motor arranged in said conduit for operation by said stream of accross liquid proportional to the rate of iow of said stream, a cylinder, a member mounted in said cylinder for back and forth movement, a valve for alternately supplying liquid from said conduit to and discharging liquid from the ends of said cylinder, means connecting said motor and valve whereby the valve is actuated at a frequency proportional to the rate of flow of said stream of liquid to alternately admit liquid under pressure to vone end of the cylinder while discharging liquid from the other end, a source of the second liquid, a pump actuated by said member, and connections for said pump whereby successive unit quantities of saidv second liquid are drawn from said source and discharged into the rst liquid in denite ratio to the rate of flow of said stream of liquid through said conduit.

3. An apparatus for adding to a stream of liquid unit quantities of a second liquid in predetermined ratio of volume, said apparatus comprising a conduit through which the stream of liquid flows, a now-responsive motor arranged in said conduit for operation by said stream of liquid proportional to the rate of ilow of said stream, a cylinder, a member mounted in said cylinder for back and forth movement, a valve for alternately supplying liquid under pressure to and discharging liquid from the ends of said cylinder, means connecting said motor andfvalve whereby the valve is actuated at a frequency proportional to the rate of ow of said stream of liquid to alternately admit liquid under pressure to one end of the cylinder while discharging liquid from the other end, a source of the second liquid, a pump actuated by said member, and connections` between said pump and said source of second liquid and between said pump and said conduit beyond said motor whereby successive unit quantities of the second liquid are drawn from said source and discharged into said liquid stream in predetermined ratio to the rate of flow of said liquid stream.

JOHN S. WATTS. 

